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Media captionAndy Moore takes a look back at George Michael\'s career
The star, who launched his career with Wham! in the 1980s and achieved massive success as a solo performer, "passed away peacefully" in Goring, Oxfordshire, his publicist said.
Thames Valley Police say they are treating the death as unexplained but there were no suspicious circumstances.
Former Wham! bandmate Andrew Ridgeley said he was "heartbroken at the loss of my beloved friend".
Writing on Twitter and referring to Michael as "Yog", a nickname for "Yours Only George", he added: "Me, his loved ones, his friends, the world of music, the world at large. 4ever loved. A xx"
The news was announced in a statement from Michael\'s publicist.
"It is with great sadness that we can confirm our beloved son, brother and friend George passed away peacefully at home over the Christmas period," it said.
"The family would ask that their privacy be respected at this difficult and emotional time. There will be no further comment at this stage."
On Instagram, Sir Elton John posted a photograph of himself with Michael, writing: "I am in deep shock. I have lost a beloved friend - the kindest, most generous soul and a brilliant artist. My heart goes out to his family and all of his fans."
Thames Valley Police said South Central Ambulance Service attended a property in Goring at 13:42 GMT on Christmas Day.
The force said: "At this stage the death is being treated as unexplained but not suspicious.
"A post-mortem will be undertaken in due course. There will be no further updates from Thames Valley Police until the post-mortem has taken place."
A small heart wreath and a rose are among the tributes that have begun to be left outside the front door of Michael\'s home, a detached property by the River Thames.
Michael, who was born Georgios Kyriacos Panayiotou in north London, sold more than 100 million albums throughout a career spanning almost four decades.
He first found fame with schoolfriend Ridgeley in duo Wham! - reaching number one in the UK singles charts on four occasions - before going on to release solo albums, including the multi-million selling Faith in 1987.
The follow-up Listen Without Prejudice Vol. 1 outsold Faith in the UK but led to Michael losing a court case with record label Sony over his frustration at how the album has been marketed.
His talents as a singer, songwriter and music producer made George Michael one of the world\'s biggest-selling artists.
Blessed with good looks and a fine singing voice, his stage presence made him a favourite on the live concert circuit as he matured from teen idol to long term stardom.
But there were times when his battle with drugs and encounters with the police made lurid headlines that threatened to eclipse his musical talents.
As a solo artist, Michael scored a further seven number one singles in the UK with songs including Careless Whisper and Fastlove, collaborated with the likes of Aretha Franklin and Elton John, and won three Brit Awards and two Grammys.
The Grammy organisers said Michael\'s "extraordinary talent had a profound impact on countless entertainers worldwide, and his creative contributions will live on forever".
Michael later began facing headlines for the wrong reasons.
In October 2006 he pleaded guilty to driving while unfit through drugs, and in 2008 was cautioned for possession of class A drugs, including crack cocaine.
In September 2010, Michael received an eight-week prison sentence following an incident in which he crashed his Range Rover into a shop in north London. He admitted driving under the influence of drugs and possessing cannabis.
Image caption George Michael and Andrew Ridgeley found fame with Wham! in the 1980s
Pop stars from Michael\'s heyday were joined by contemporary names in paying tribute on Twitter.
ABC frontman Martin Fry said: "Absolutely devastated to hear of the loss of @GeorgeMichael Truly brilliant talent #sad #sad #sad."
Duran Duran referred to the the so-called curse of 2016 - following the deaths of David Bowie, Prince and Rick Parfitt - posting on their official Twitter account: "2016 - loss of another talented soul. All our love and sympathy to @GeorgeMichael\'s family."
The band included a picture of Michael with singer Simon Le Bon, Sting and Bob Geldof.
Madonna also took to Twitter and Instagram to pay tribute to Michael - posting a video of herself presenting the singer with an award in 1989 and writing "Another Great Artist leaves us".
Robbie Williams, whose first solo single was a cover of Michael\'s song Freedom, wrote: "Oh God no …I love you George …Rest In Peace x".
Singer Pixie Lott tweeted: "Grew up listening to the beautiful and talented @GeorgeMichael - my mama\'s favourite! was a pleasure to meet him so sad to hear the news."
Fellow pop star La Roux wrote: "Another one gone.... What a voice, what a songwriter."
DJ Tony Blackburn said: "Unbelievable, George Michael has died at the age of 53. RIP.This dreadful year goes on and on. So sad, a real talent."
I Knew You Were Waiting For Me (with Aretha Franklin) - 1987
Don\'t Let the Sun Go Down on Me (with Elton John) - 1991
Five Live EP (with Queen and Lisa Stansfield) - 1993
Earlier this month it was announced that producer and songwriter Naughty Boy was working with Michael on a new album.
Image caption Outside Highbury Corner Magistrates\' Court in 2010 - Michael had a series of run-ins with police
A documentary film entitled Freedom was also due for release next March.
In 2011, Michael postponed a series of concerts after being taken to hospital for treatment for pneumonia.
After treatment in a Vienna hospital, he made a tearful appearance outside his London home and said it had been "touch and go" whether he lived.
Doctors were reported to have performed a tracheotomy to keep his airways open and he was unconscious for some of his spell in hospital.
After years of refusing to be drawn on speculation about his sexuality, Michael disclosed he was gay in 1998 after being was arrested in a public toilet in Beverly Hills, California, for engaging in a lewd act.
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